32G CF CARD NOT FORMATTING IN CANON 5D CAMERA OR COMPUTER

HI EVERYONE ...I RECENTLY ENCOUNTERD A PROBLEM WITH A SANDISK 32G CF CARD ..WHEN I INSERT THE CARD INTO THE 5D CANON DLSR ..THE CARD FIRSTLY DOESNT READ FIRST THEN UPON REENTERING THE CARD BACK INTO THE CAMERA IT READS AND SENDS A MESSAGE THAT THE CARD NEDDS TO BE FORMATTED ..SO I GO INTO OPTIONS AND FORMAT THROUGH THE 5D AND IT SEND ANOTHER MESSAGE SAYING CARD CANNOT BE FORMATED ..SO I ENTER IT INTO MY MAC AND THE CARD DOESNT READ ...I ALSO ENTERED IT INTO A PC AND MANAGED TO FORMATTED IT THERE BUT UPON ENTERING IT INTO THE CAMERA THE SAME MESSAGE APPEARS (CARD TO BE FORMATTED) I CURRENTLY CANNOT USE THIS CARD ...DOES ANYONE KNOW OF A SOLUTION TO THIS PROBLEM ?